AD7142ACPZ Integrated capacitive-to-digital converter (CDC) with on-chip environmental calibration,
The AD7142 and AD7142-1 are integrated capacitive-to-digital converters (CDCs) with on-chip environmental calibration for use in systems that require new user input methods. The AD7142 and AD7142-1 can interface with external capacitive sensors to enable functions such as capacitive buttons, scroll bars, or scroll wheels.
The CDC has 14 input channels connected to a 16-bit, 250 kHz sigma-delta capacitor-to-digital converter via a switching matrix. The CDC is able to sense changes in the capacitance of external sensors and use this information to record sensor activation events. The external sensor can be configured as a series of buttons, as a scroll bar or scroll wheel, or as a combination of sensors. By programming the registers, the user has full control over the CDC settings. High-resolution sensors require less software to run on the main processor.
The AD7142 and AD7142-1 are equipped with on-chip calibration logic to account for changes in the surrounding environment. When the sensor is idle, the calibration sequence is automatically executed at continuous intervals. This avoids accidental touches of external sensors due to environmental changes or unrecorded touches.
The AD7142 features an SPI-compatible serial interface
Both the AD7142 and AD7142-1 are available in a 32-pin 5 mm ?5 mm LFCSP_VQ package and operate from 2.6 V ~ 3.6 V. Operating power consumption is less than 1 mA and can be reduced to 50 μA in low-power mode (400 ms conversion interval).
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- Personal music player and multimedia player
- Cellular phones
- Digital camera
- Smart handheld devices
- TV, A/V and remote control
-Game
Features and Benefits:
- 可编程的电容数字转换器
36 ms的更新速率（最大序列长度时）
分辨率优于1 fF
14个电容式传感器输入通道
无需使用外部RC调谐元件
自动转换定序器
- 片内自动校准逻辑
自动补偿环境变化
自适应的阈值和灵敏度电平
- 用片内RAM存储校准数据
- SPI®兼容型串行接口(AD7142)
- I2C®兼容型串行接口(AD7142-1)
- 串行接口专用独立VDRIVE电平
- 中断输出和GPIO
- 32-引脚、5 mm x 5 mm LFCSP_VQ封装
- 电源电压：2.6 V至3.6 V
- 低工作电流
全功率模式：小于1 mA
低功耗模式：50 µA